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Andrea
  • Member for 10 years, 11 months
  • Last seen more than 1 year ago
116 votes

Finite subgroups of the multiplicative group of a field are cyclic

42 votes

Similar matrices and field extensions

35 votes

If the localization of a ring $R$ at every prime ideal is an integral domain, must $R$ be an integral domain?

17 votes
Accepted

Motivation behind the definition of flat module

17 votes
Accepted

Is the number of prime ideals of a zero-dimensional ring stable under base change?

15 votes

The total ring of fractions of a reduced Noetherian ring is a direct product of fields

15 votes

Primary ideals of Noetherian rings which are not irreducible

15 votes
Accepted

Is the radical of an irreducible ideal irreducible?

10 votes
Accepted

In $K[X,Y]$, is the power of any prime also primary?

10 votes

A square matrix has the same minimal polynomial over its base field as it has over an extension field

9 votes

Are there Zariski-continuous maps between algebraic sets that are not polynomial maps?

9 votes
Accepted

Linearly disjoint field extensions

9 votes
Accepted

Intersection of irreducible components of a smooth curve

8 votes

When do two matrices have the same column space?

8 votes

Noetherian integral domain such that $m/m^2$ is a one-dimensional vector space over $A/m$

8 votes

What is the differences between scheme-theoretical intersection and set-theoretical intersection?

8 votes

Proving $2,3,1+\sqrt{-5}$ and $1-\sqrt{-5}$ are irreducible in $\mathbb{Z}[\sqrt{-5}]$

8 votes
Accepted

Knot with genus $1$ and trivial Alexander polynomial?

7 votes
Accepted

Artinian local $k$-algebra

7 votes

Can a matrix in $\mathbb{R}$ have a minimal polynomial that has coefficients in $\mathbb{C}$?

6 votes

Invertible modules are locally free of rank 1

6 votes

Prove that an infinite ring with finite quotient rings is an integral domain

6 votes

Spectrum of finite $k$-algebras

6 votes
Accepted

Is there a $C^\infty$ function $f$ s. t. the convergent radius of Maclaurin series of $f$ is $0$?

6 votes
Accepted

Homology of $\mathbb{R}^3 - S^1$

6 votes

Similar matrices and field extensions

6 votes

How to Compute Genus

5 votes
Accepted

Stalk of coherent sheaf vanishing

5 votes
Accepted

Is invertibility a stalk-local property?

5 votes

How to calculate the determinant of all-ones matrix minus the identity?